hey dude,
mine radiator started leaking on the weekend.
i rang 10 places, they all said the same price for a r33 gtst manual 97 copper core radiator $330, for just the radiator (copper core u can repair, ie weld, the old types, aluminium cant touch them).
Instalation is about $120, but im doing it myself. its prety easy to take out, just have to take off 4 scerws, 2 pipes, and then becarfull not 2 get the coolant on u, then slide the radiator out. then when u get the new 1, flush the engine with water put in the new 1 and fill it up with 90+ coolant.
i rang nissan and they gave me a stupid price for an original nissan radiator for $850 lol also rang some jap places n they had 2nd hand ones for about $250, so no point getting 2nd hand.
give Holden Hill Radiator Repairs (08 8261 6173) a call n get a price for one from there, they can install as well, i just picked mine up 10 min ago lol.